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1 /* SPDX-License-Identifier: GPL-2.0-only */
2 #ifndef _ASM_X86_APIC_H
3 #define _ASM_X86_APIC_H
4 
5 #include <linux/cpumask.h>
6 
7 #include <asm/alternative.h>
8 #include <asm/cpufeature.h>
9 #include <asm/apicdef.h>
10 #include <linux/atomic.h>
11 #include <asm/fixmap.h>
12 #include <asm/mpspec.h>
13 #include <asm/msr.h>
14 #include <asm/hardirq.h>
15 
16 #define ARCH_APICTIMER_STOPS_ON_C3	1
17 
18 /*
19  * Debugging macros
20  */
21 #define APIC_QUIET   0
22 #define APIC_VERBOSE 1
23 #define APIC_DEBUG   2
24 
25 /* Macros for apic_extnmi which controls external NMI masking */
26 #define APIC_EXTNMI_BSP		0 /* Default */
27 #define APIC_EXTNMI_ALL		1
28 #define APIC_EXTNMI_NONE	2
29 
30 /*
31  * Define the default level of output to be very little
32  * This can be turned up by using apic=verbose for more
33  * information and apic=debug for _lots_ of information.
34  * apic_verbosity is defined in apic.c
35  */
36 #define apic_printk(v, s, a...) do {       \
37 		if ((v) <= apic_verbosity) \
38 			printk(s, ##a);    \
39 	} while (0)
40 
41 
42 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
43 extern void generic_apic_probe(void);
44 #else
generic_apic_probe(void)45 static inline void generic_apic_probe(void)
46 {
47 }
48 #endif
49 
50 #ifdef CONFIG_X86_LOCAL_APIC
51 
52 extern int apic_verbosity;
53 extern int local_apic_timer_c2_ok;
54 
55 extern int disable_apic;
56 extern unsigned int lapic_timer_period;
57 
58 extern enum apic_intr_mode_id apic_intr_mode;
59 enum apic_intr_mode_id {
60 	APIC_PIC,
61 	APIC_VIRTUAL_WIRE,
62 	APIC_VIRTUAL_WIRE_NO_CONFIG,
63 	APIC_SYMMETRIC_IO,
64 	APIC_SYMMETRIC_IO_NO_ROUTING
65 };
66 
67 #ifdef CONFIG_SMP
68 extern void __inquire_remote_apic(int apicid);
69 #else /* CONFIG_SMP */
__inquire_remote_apic(int apicid)70 static inline void __inquire_remote_apic(int apicid)
71 {
72 }
73 #endif /* CONFIG_SMP */
74 
default_inquire_remote_apic(int apicid)75 static inline void default_inquire_remote_apic(int apicid)
76 {
77 	if (apic_verbosity >= APIC_DEBUG)
78 		__inquire_remote_apic(apicid);
79 }
80 
81 /*
82  * With 82489DX we can't rely on apic feature bit
83  * retrieved via cpuid but still have to deal with
84  * such an apic chip so we assume that SMP configuration
85  * is found from MP table (64bit case uses ACPI mostly
86  * which set smp presence flag as well so we are safe
87  * to use this helper too).
88  */
apic_from_smp_config(void)89 static inline bool apic_from_smp_config(void)
90 {
91 	return smp_found_config && !disable_apic;
92 }
93 
94 /*
95  * Basic functions accessing APICs.
96  */
97 #ifdef CONFIG_PARAVIRT
98 #include <asm/paravirt.h>
99 #endif
100 
101 extern int setup_profiling_timer(unsigned int);
102 
native_apic_mem_write(u32 reg,u32 v)103 static inline void native_apic_mem_write(u32 reg, u32 v)
104 {
105 	volatile u32 *addr = (volatile u32 *)(APIC_BASE + reg);
106 
107 	alternative_io("movl %0, %P1", "xchgl %0, %P1", X86_BUG_11AP,
108 		       ASM_OUTPUT2("=r" (v), "=m" (*addr)),
109 		       ASM_OUTPUT2("0" (v), "m" (*addr)));
110 }
111 
native_apic_mem_read(u32 reg)112 static inline u32 native_apic_mem_read(u32 reg)
113 {
114 	return *((volatile u32 *)(APIC_BASE + reg));
115 }
116 
117 extern void native_apic_wait_icr_idle(void);
118 extern u32 native_safe_apic_wait_icr_idle(void);
119 extern void native_apic_icr_write(u32 low, u32 id);
120 extern u64 native_apic_icr_read(void);
121 
apic_is_x2apic_enabled(void)122 static inline bool apic_is_x2apic_enabled(void)
123 {
124 	u64 msr;
125 
126 	if (rdmsrl_safe(MSR_IA32_APICBASE, &msr))
127 		return false;
128 	return msr & X2APIC_ENABLE;
129 }
130 
131 extern void enable_IR_x2apic(void);
132 
133 extern int get_physical_broadcast(void);
134 
135 extern int lapic_get_maxlvt(void);
136 extern void clear_local_APIC(void);
137 extern void disconnect_bsp_APIC(int virt_wire_setup);
138 extern void disable_local_APIC(void);
139 extern void apic_soft_disable(void);
140 extern void lapic_shutdown(void);
141 extern void sync_Arb_IDs(void);
142 extern void init_bsp_APIC(void);
143 extern void apic_intr_mode_select(void);
144 extern void apic_intr_mode_init(void);
145 extern void init_apic_mappings(void);
146 void register_lapic_address(unsigned long address);
147 extern void setup_boot_APIC_clock(void);
148 extern void setup_secondary_APIC_clock(void);
149 extern void lapic_update_tsc_freq(void);
150 
151 #ifdef CONFIG_X86_64
apic_force_enable(unsigned long addr)152 static inline int apic_force_enable(unsigned long addr)
153 {
154 	return -1;
155 }
156 #else
157 extern int apic_force_enable(unsigned long addr);
158 #endif
159 
160 extern void apic_ap_setup(void);
161 
162 /*
163  * On 32bit this is mach-xxx local
164  */
165 #ifdef CONFIG_X86_64
166 extern int apic_is_clustered_box(void);
167 #else
apic_is_clustered_box(void)168 static inline int apic_is_clustered_box(void)
169 {
170 	return 0;
171 }
172 #endif
173 
174 extern int setup_APIC_eilvt(u8 lvt_off, u8 vector, u8 msg_type, u8 mask);
175 extern void lapic_assign_system_vectors(void);
176 extern void lapic_assign_legacy_vector(unsigned int isairq, bool replace);
177 extern void lapic_update_legacy_vectors(void);
178 extern void lapic_online(void);
179 extern void lapic_offline(void);
180 extern bool apic_needs_pit(void);
181 
182 extern void apic_send_IPI_allbutself(unsigned int vector);
183 
184 #else /* !CONFIG_X86_LOCAL_APIC */
lapic_shutdown(void)185 static inline void lapic_shutdown(void) { }
186 #define local_apic_timer_c2_ok		1
init_apic_mappings(void)187 static inline void init_apic_mappings(void) { }
disable_local_APIC(void)188 static inline void disable_local_APIC(void) { }
189 # define setup_boot_APIC_clock x86_init_noop
190 # define setup_secondary_APIC_clock x86_init_noop
lapic_update_tsc_freq(void)191 static inline void lapic_update_tsc_freq(void) { }
init_bsp_APIC(void)192 static inline void init_bsp_APIC(void) { }
apic_intr_mode_select(void)193 static inline void apic_intr_mode_select(void) { }
apic_intr_mode_init(void)194 static inline void apic_intr_mode_init(void) { }
lapic_assign_system_vectors(void)195 static inline void lapic_assign_system_vectors(void) { }
lapic_assign_legacy_vector(unsigned int i,bool r)196 static inline void lapic_assign_legacy_vector(unsigned int i, bool r) { }
apic_needs_pit(void)197 static inline bool apic_needs_pit(void) { return true; }
198 #endif /* !CONFIG_X86_LOCAL_APIC */
199 
200 #ifdef CONFIG_X86_X2APIC
native_apic_msr_write(u32 reg,u32 v)201 static inline void native_apic_msr_write(u32 reg, u32 v)
202 {
203 	if (reg == APIC_DFR || reg == APIC_ID || reg == APIC_LDR ||
204 	    reg == APIC_LVR)
205 		return;
206 
207 	wrmsr(APIC_BASE_MSR + (reg >> 4), v, 0);
208 }
209 
native_apic_msr_eoi_write(u32 reg,u32 v)210 static inline void native_apic_msr_eoi_write(u32 reg, u32 v)
211 {
212 	__wrmsr(APIC_BASE_MSR + (APIC_EOI >> 4), APIC_EOI_ACK, 0);
213 }
214 
native_apic_msr_read(u32 reg)215 static inline u32 native_apic_msr_read(u32 reg)
216 {
217 	u64 msr;
218 
219 	if (reg == APIC_DFR)
220 		return -1;
221 
222 	rdmsrl(APIC_BASE_MSR + (reg >> 4), msr);
223 	return (u32)msr;
224 }
225 
native_x2apic_wait_icr_idle(void)226 static inline void native_x2apic_wait_icr_idle(void)
227 {
228 	/* no need to wait for icr idle in x2apic */
229 	return;
230 }
231 
native_safe_x2apic_wait_icr_idle(void)232 static inline u32 native_safe_x2apic_wait_icr_idle(void)
233 {
234 	/* no need to wait for icr idle in x2apic */
235 	return 0;
236 }
237 
native_x2apic_icr_write(u32 low,u32 id)238 static inline void native_x2apic_icr_write(u32 low, u32 id)
239 {
240 	wrmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), ((__u64) id) << 32 | low);
241 }
242 
native_x2apic_icr_read(void)243 static inline u64 native_x2apic_icr_read(void)
244 {
245 	unsigned long val;
246 
247 	rdmsrl(APIC_BASE_MSR + (APIC_ICR >> 4), val);
248 	return val;
249 }
250 
251 extern int x2apic_mode;
252 extern int x2apic_phys;
253 extern void __init x2apic_set_max_apicid(u32 apicid);
254 extern void __init check_x2apic(void);
255 extern void x2apic_setup(void);
x2apic_enabled(void)256 static inline int x2apic_enabled(void)
257 {
258 	return boot_cpu_has(X86_FEATURE_X2APIC) && apic_is_x2apic_enabled();
259 }
260 
261 #define x2apic_supported()	(boot_cpu_has(X86_FEATURE_X2APIC))
262 #else /* !CONFIG_X86_X2APIC */
check_x2apic(void)263 static inline void check_x2apic(void) { }
x2apic_setup(void)264 static inline void x2apic_setup(void) { }
x2apic_enabled(void)265 static inline int x2apic_enabled(void) { return 0; }
266 
267 #define x2apic_mode		(0)
268 #define	x2apic_supported()	(0)
269 #endif /* !CONFIG_X86_X2APIC */
270 
271 struct irq_data;
272 
273 /*
274  * Copyright 2004 James Cleverdon, IBM.
275  *
276  * Generic APIC sub-arch data struct.
277  *
278  * Hacked for x86-64 by James Cleverdon from i386 architecture code by
279  * Martin Bligh, Andi Kleen, James Bottomley, John Stultz, and
280  * James Cleverdon.
281  */
282 struct apic {
283 	/* Hotpath functions first */
284 	void	(*eoi_write)(u32 reg, u32 v);
285 	void	(*native_eoi_write)(u32 reg, u32 v);
286 	void	(*write)(u32 reg, u32 v);
287 	u32	(*read)(u32 reg);
288 
289 	/* IPI related functions */
290 	void	(*wait_icr_idle)(void);
291 	u32	(*safe_wait_icr_idle)(void);
292 
293 	void	(*send_IPI)(int cpu, int vector);
294 	void	(*send_IPI_mask)(const struct cpumask *mask, int vector);
295 	void	(*send_IPI_mask_allbutself)(const struct cpumask *msk, int vec);
296 	void	(*send_IPI_allbutself)(int vector);
297 	void	(*send_IPI_all)(int vector);
298 	void	(*send_IPI_self)(int vector);
299 
300 	/* dest_logical is used by the IPI functions */
301 	u32	dest_logical;
302 	u32	disable_esr;
303 	u32	irq_delivery_mode;
304 	u32	irq_dest_mode;
305 
306 	u32	(*calc_dest_apicid)(unsigned int cpu);
307 
308 	/* ICR related functions */
309 	u64	(*icr_read)(void);
310 	void	(*icr_write)(u32 low, u32 high);
311 
312 	/* Probe, setup and smpboot functions */
313 	int	(*probe)(void);
314 	int	(*acpi_madt_oem_check)(char *oem_id, char *oem_table_id);
315 	int	(*apic_id_valid)(u32 apicid);
316 	int	(*apic_id_registered)(void);
317 
318 	bool	(*check_apicid_used)(physid_mask_t *map, int apicid);
319 	void	(*init_apic_ldr)(void);
320 	void	(*ioapic_phys_id_map)(physid_mask_t *phys_map, physid_mask_t *retmap);
321 	void	(*setup_apic_routing)(void);
322 	int	(*cpu_present_to_apicid)(int mps_cpu);
323 	void	(*apicid_to_cpu_present)(int phys_apicid, physid_mask_t *retmap);
324 	int	(*check_phys_apicid_present)(int phys_apicid);
325 	int	(*phys_pkg_id)(int cpuid_apic, int index_msb);
326 
327 	u32	(*get_apic_id)(unsigned long x);
328 	u32	(*set_apic_id)(unsigned int id);
329 
330 	/* wakeup_secondary_cpu */
331 	int	(*wakeup_secondary_cpu)(int apicid, unsigned long start_eip);
332 
333 	void	(*inquire_remote_apic)(int apicid);
334 
335 #ifdef CONFIG_X86_32
336 	/*
337 	 * Called very early during boot from get_smp_config().  It should
338 	 * return the logical apicid.  x86_[bios]_cpu_to_apicid is
339 	 * initialized before this function is called.
340 	 *
341 	 * If logical apicid can't be determined that early, the function
342 	 * may return BAD_APICID.  Logical apicid will be configured after
343 	 * init_apic_ldr() while bringing up CPUs.  Note that NUMA affinity
344 	 * won't be applied properly during early boot in this case.
345 	 */
346 	int (*x86_32_early_logical_apicid)(int cpu);
347 #endif
348 	char	*name;
349 };
350 
351 /*
352  * Pointer to the local APIC driver in use on this system (there's
353  * always just one such driver in use - the kernel decides via an
354  * early probing process which one it picks - and then sticks to it):
355  */
356 extern struct apic *apic;
357 
358 /*
359  * APIC drivers are probed based on how they are listed in the .apicdrivers
360  * section. So the order is important and enforced by the ordering
361  * of different apic driver files in the Makefile.
362  *
363  * For the files having two apic drivers, we use apic_drivers()
364  * to enforce the order with in them.
365  */
366 #define apic_driver(sym)					\
367 	static const struct apic *__apicdrivers_##sym __used		\
368 	__aligned(sizeof(struct apic *))			\
369 	__section(".apicdrivers") = { &sym }
370 
371 #define apic_drivers(sym1, sym2)					\
372 	static struct apic *__apicdrivers_##sym1##sym2[2] __used	\
373 	__aligned(sizeof(struct apic *))				\
374 	__section(".apicdrivers") = { &sym1, &sym2 }
375 
376 extern struct apic *__apicdrivers[], *__apicdrivers_end[];
377 
378 /*
379  * APIC functionality to boot other CPUs - only used on SMP:
380  */
381 #ifdef CONFIG_SMP
382 extern int wakeup_secondary_cpu_via_nmi(int apicid, unsigned long start_eip);
383 extern int lapic_can_unplug_cpu(void);
384 #endif
385 
386 #ifdef CONFIG_X86_LOCAL_APIC
387 
apic_read(u32 reg)388 static inline u32 apic_read(u32 reg)
389 {
390 	return apic->read(reg);
391 }
392 
apic_write(u32 reg,u32 val)393 static inline void apic_write(u32 reg, u32 val)
394 {
395 	apic->write(reg, val);
396 }
397 
apic_eoi(void)398 static inline void apic_eoi(void)
399 {
400 	apic->eoi_write(APIC_EOI, APIC_EOI_ACK);
401 }
402 
apic_icr_read(void)403 static inline u64 apic_icr_read(void)
404 {
405 	return apic->icr_read();
406 }
407 
apic_icr_write(u32 low,u32 high)408 static inline void apic_icr_write(u32 low, u32 high)
409 {
410 	apic->icr_write(low, high);
411 }
412 
apic_wait_icr_idle(void)413 static inline void apic_wait_icr_idle(void)
414 {
415 	apic->wait_icr_idle();
416 }
417 
safe_apic_wait_icr_idle(void)418 static inline u32 safe_apic_wait_icr_idle(void)
419 {
420 	return apic->safe_wait_icr_idle();
421 }
422 
423 extern void __init apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v));
424 
425 #else /* CONFIG_X86_LOCAL_APIC */
426 
apic_read(u32 reg)427 static inline u32 apic_read(u32 reg) { return 0; }
apic_write(u32 reg,u32 val)428 static inline void apic_write(u32 reg, u32 val) { }
apic_eoi(void)429 static inline void apic_eoi(void) { }
apic_icr_read(void)430 static inline u64 apic_icr_read(void) { return 0; }
apic_icr_write(u32 low,u32 high)431 static inline void apic_icr_write(u32 low, u32 high) { }
apic_wait_icr_idle(void)432 static inline void apic_wait_icr_idle(void) { }
safe_apic_wait_icr_idle(void)433 static inline u32 safe_apic_wait_icr_idle(void) { return 0; }
apic_set_eoi_write(void (* eoi_write)(u32 reg,u32 v))434 static inline void apic_set_eoi_write(void (*eoi_write)(u32 reg, u32 v)) {}
435 
436 #endif /* CONFIG_X86_LOCAL_APIC */
437 
438 extern void apic_ack_irq(struct irq_data *data);
439 
ack_APIC_irq(void)440 static inline void ack_APIC_irq(void)
441 {
442 	/*
443 	 * ack_APIC_irq() actually gets compiled as a single instruction
444 	 * ... yummie.
445 	 */
446 	apic_eoi();
447 }
448 
449 
lapic_vector_set_in_irr(unsigned int vector)450 static inline bool lapic_vector_set_in_irr(unsigned int vector)
451 {
452 	u32 irr = apic_read(APIC_IRR + (vector / 32 * 0x10));
453 
454 	return !!(irr & (1U << (vector % 32)));
455 }
456 
default_get_apic_id(unsigned long x)457 static inline unsigned default_get_apic_id(unsigned long x)
458 {
459 	unsigned int ver = GET_APIC_VERSION(apic_read(APIC_LVR));
460 
461 	if (APIC_XAPIC(ver) || boot_cpu_has(X86_FEATURE_EXTD_APICID))
462 		return (x >> 24) & 0xFF;
463 	else
464 		return (x >> 24) & 0x0F;
465 }
466 
467 /*
468  * Warm reset vector position:
469  */
470 #define TRAMPOLINE_PHYS_LOW		0x467
471 #define TRAMPOLINE_PHYS_HIGH		0x469
472 
473 extern void generic_bigsmp_probe(void);
474 
475 #ifdef CONFIG_X86_LOCAL_APIC
476 
477 #include <asm/smp.h>
478 
479 #define APIC_DFR_VALUE	(APIC_DFR_FLAT)
480 
481 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
482 
483 extern struct apic apic_noop;
484 
read_apic_id(void)485 static inline unsigned int read_apic_id(void)
486 {
487 	unsigned int reg = apic_read(APIC_ID);
488 
489 	return apic->get_apic_id(reg);
490 }
491 
492 extern int default_apic_id_valid(u32 apicid);
493 extern int default_acpi_madt_oem_check(char *, char *);
494 extern void default_setup_apic_routing(void);
495 
496 extern u32 apic_default_calc_apicid(unsigned int cpu);
497 extern u32 apic_flat_calc_apicid(unsigned int cpu);
498 
499 extern bool default_check_apicid_used(physid_mask_t *map, int apicid);
500 extern void default_ioapic_phys_id_map(physid_mask_t *phys_map, physid_mask_t *retmap);
501 extern int default_cpu_present_to_apicid(int mps_cpu);
502 extern int default_check_phys_apicid_present(int phys_apicid);
503 
504 #endif /* CONFIG_X86_LOCAL_APIC */
505 
506 #ifdef CONFIG_SMP
507 bool apic_id_is_primary_thread(unsigned int id);
508 void apic_smt_update(void);
509 #else
apic_id_is_primary_thread(unsigned int id)510 static inline bool apic_id_is_primary_thread(unsigned int id) { return false; }
apic_smt_update(void)511 static inline void apic_smt_update(void) { }
512 #endif
513 
514 struct msi_msg;
515 
516 #ifdef CONFIG_PCI_MSI
517 void x86_vector_msi_compose_msg(struct irq_data *data, struct msi_msg *msg);
518 #else
519 # define x86_vector_msi_compose_msg NULL
520 #endif
521 
522 extern void ioapic_zap_locks(void);
523 
524 #endif /* _ASM_X86_APIC_H */
525